Final answer:
Pressure is caused by collisions of molecules, converting phases of matter, and changes in bonding. Conduction of heat does not directly cause pressure.
Step-by-step explanation:
Pressure is caused by collisions of molecules within a substance or between a substance and its surroundings. When molecules collide, they exert a force on each other, resulting in pressure. For example, when we pump air into a tire, the air molecules collide with the walls of the tire, creating pressure that inflates the tire.
Pressure can also be caused by converting phases of matter. For instance, when water vapor condenses into liquid water, the molecules become closer together and exert a greater force, leading to an increase in pressure.
In addition, changes in bonding can influence pressure. When a substance undergoes a chemical reaction, the arrangement of atoms and molecules may change, resulting in different forces between them and altering the pressure.
While conduction of heat can affect the temperature of a substance, it does not directly cause pressure.
Learn more about Causes of pressure